a lifetime ban for what the agency described as armstrong's role in leading a, quote, systemic, sustained and highly professionalized team-run doping conspiracy. in 2005, armstrong testified under oath that he did not use performance-enhancing drugs during his racing career. over the years, armstrong has weathered a number of challenges in that regard. but the timing of a potential public admission may be rooted on legal grounds, says nbc's justice correspondent, pete williams. >> it's unlikely he would be prosecuted for perjury, because the only statement he made under oath was seven years ago, beyond the statute of limitations. so it's more likely he would face civil lawsuits. >> reporter: for now, boundless questions remain for lance armstrong, whose answers have yet to come, if ever. ron mott, nbc news, boston. the massacre at sandy hook elementary school in newtown, connecticut, was a month ago today. while we're waiting for washington to weigh in on the subject of guns in america, it was an emotional day in that small new england town.